Fix for #205 allow collector path in host url

[EEParker]

This should allow for the previous collector path in the host url.

[EEParker]

@VictorioBerra can you test this to see if it meets your needs?

[github-actions]

Package	Line Rate	Branch Rate	Health
Serilog.Sinks.Splunk	50%	63%	❌
Serilog.Sinks.Splunk.TCP	65%	43%	➖
Serilog.Sinks.Splunk	19%	19%	❌
Summary	43% (334 / 812)	44% (86 / 208)	❌

[VictorioBerra]

@EEParker Works great!

My config

  "Serilog": {
    "WriteTo": [
      {
        "Name": "EventCollector",
        "Args": {
          "splunkHost": "https://splunk.company.com/services/collector",
          "eventCollectorToken": "111-222-333-444-555"
        }
      }
    ]
  }